IBAN
International Bank Account Number, consisting of ISO country code (two digits), a checksum (two digits), the national bank code or sort code (in Germany, it is called "Bankleitzahl") and the account number. The length of IBANs differs between countries (the maximum is 34 alphanumeric characters), but it is always the same within one country.
For National Bank Code I would just enter the Sort Code, that is the code that distinguishes the bank from any other.
http://www.iban-bic.com/calculate_IBAN_and_BIC.0.html?L=2
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